/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * Copyright 1999-2002,2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.sun.org.apache.xerces.internal.impl.dv.dtd;

import com.sun.org.apache.xerces.internal.impl.dv.*;
import com.sun.org.apache.xerces.internal.util.XMLChar;

/**
 * <P>IDDatatypeValidator - ID represents the ID attribute
 * type from XML 1.0 Recommendation. The value space
 * od ID is the set of all strings that match the
 * NCName production and have been used in an XML
 * document. The lexical space of ID is the set of all
 * strings that match the NCName production.</P>
 * <P>The value space of ID is scoped to a specific
 * instance document.</P>
 * <P>The following constraint applies:
 * An ID must not appear more than once in an XML
 * document as a value of this type; i.e., ID values
 * must uniquely identify the elements which bear
 * them.</P>
 *
 * @author Jeffrey Rodriguez, IBM
 * @author Sandy Gao, IBM
 * @xerces.internal
 */
public class IDDatatypeValidator implements DatatypeValidator {

  // construct an ID datatype validator
  public IDDatatypeValidator() {
  }

  /**
   * Checks that "content" string is valid ID value.
   * If invalid a Datatype validation exception is thrown.
   *
   * @param content the string value that needs to be validated
   * @param context the validation context
   * @throws InvalidDatatypeException if the content is invalid according to the rules for the
   * validators
   * @see InvalidDatatypeValueException
   */
  public void validate(String content, ValidationContext context)
      throws InvalidDatatypeValueException {

    //Check if is valid key-[81] EncName ::= [A-Za-z] ([A-Za-z0-9._] | '-')*
    if (context.useNamespaces()) {
      if (!XMLChar.isValidNCName(content)) {
        throw new InvalidDatatypeValueException("IDInvalidWithNamespaces", new Object[]{content});
      }
    } else {
      if (!XMLChar.isValidName(content)) {
        throw new InvalidDatatypeValueException("IDInvalid", new Object[]{content});
      }
    }

    if (context.isIdDeclared(content)) {
      throw new InvalidDatatypeValueException("IDNotUnique", new Object[]{content});
    }

    context.addId(content);
  }

}
